Designing a HVDC Insulation System to Endure Electrical and Thermal Stresses Under Operation. Part I: Partial Discharge Magnitude and Repetition Rate During Transients and in DC Steady State

This paper has the purpose to investigate HVDC insulation design considering real operating conditions, when DC steady-state is affected by frequent voltage transients or load variations that may be present during all life. Electrical field distribution in insulation, and defects, change significantly from vary with time, which can cause partial discharge activity often not been properly accounted for at stage. The Part I of this dedicated prove, through experiments, models simulations, electrical thermal incept discharges defective insulations cable energization, polarity inversion a constant nominal load, as well voltage. accelerated aging premature breakdown even if system designed withstand electrothermal stress, without steady state, life, it will shown II. Focus on cables, but approach described here general any system.